#pragma once 
#include<iostream>
#include "Protocol.hpp"

enum
{
    Div_Zero = 1,
    Mod_Zero, 
    Other_Oper
};

class ServerCal
{
public:
    ServerCal() {}

    Response CalculatorHelper(const Request& req)
    {
        Response resp(0, 0);
        switch(req.op)
        {
        case '+':
            resp.result = req.x + req.y;
            break;
        case '-':
            resp.result = req.x - req.y;
            break;
        case '*':
            resp.result = req.x * req.y;
            break;
        case '/':
        {
            if(req.y == 0)
                resp.code = Div_Zero;
            else 
                resp.result = req.x / req.y;
        }
        break;
        case '%':
        {
            if(req.y == 0)
                resp.code = Mod_Zero;
            else 
                resp.result = req.x % req.y;
        }
        break;
        default:
            resp.code = Other_Oper;
            break;
        }
        return resp;
    }

    std::string Calculator(std::string& package)
    {
        std::string content;
        bool r = Decode(package, &content);
        if(!r)
            return "";
        Request req;
        r = req.Deserialize(content);
        if(!r)
            return "";
        content = "";
        Response resp = CalculatorHelper(req);
        resp.Serialize(&content);
        content = Encode(content);

        return content;
    }
    ~ServerCal() {}
};